Chapter 4: Operation of Web-based Management
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Subnet mask: Any IP device in a network must own its IP address, which is composed of a Network address and a Host address; otherwise
it can’t communicate with other devices. Subnet mask enables more network addresses. Network classes A, B, and C are too large to fit for
almost all networks, so, subnet mask is introduced to solve this problem. Subnet mask uses some bits from a host address and creates an IP
address consisting of Network address, Subnet mask number, and host address. This reduces the total IP number of a network able to
support, by the amount of 2 power of the bit number of subnet number (2^[bit number of subnet number]).
Subnet mask is used to set the subnet mask value, which should be the same value as that of the other devices attached to the same
network
Default: 255.255.255.0
Default gateway: Set an IP address for a gateway to handle those packets that do not meet the routing rules predefined in the device. If a
packet does not meet the criteria for another pre-defined path, it must be forwarded to a default router on a default path. This means that
any packet with an undefined IP address in the routing table will be sent to this device unconditionally.
Default: 192.168.1.254
DNS: Domain Name Server translates between IP address and name address.
The switch supports the DNS client function to re-route the mnemonic name address to the DNS server to get its associated IP address for
accessing the Internet. Users can specify a DNS IP address for the switch. With this, the switch can translate a mnemonic name address into
an IP address.
There are two ways to specify the IP address of DNS. One is fixed mode, which manually specifies its IP address, the other is dynamic mode,
which is assigned by DHCP server while DHCP is enabled. DNS can help you easily remember the mnemonic address name with meaningful
words in it. The default is no assignment of DNS address.
Default: 0.0.0.0
4.2.5 Loop Detection
The loop detection is used to detect the presence of traffic. When the switch receives a packet’s (looping detection frame) MAC address
that is the same as the one from the port, show Loop is detected. The port will be locked when it receives the looping detection frames. If
you want to resume using the locked port, find the looping path, remove it, then select the locked port and click on “Resume” to enable it.
Function name: Loop Detection
Function description: Displays whether the switch is set up for Loop detection and whether a port has been locked due to loop detection.
Also provides the ability to resume normal operation after leaving a loopback path.
32 bits
Network ID
Host ID
Network ID
Host ID
Subnet number